Author: Florian Privé

In this post, I present something I am currently investigating (feedback welcome!) and that I am implementing in my new package {bigutilsr}. This package can be used to detect outlier...continue reading.

In this post, I present my new package {img2coord}. This package can be used to retrieve coordinates from a scatter plot (as an image). devtools::install_github("privefl/img2coord") Have you ever made a...continue reading.

In this post, I’m evaluating some ways of choosing hyper-parameters (\(\alpha\) and \(\lambda\)) in penalized linear regression. The same principles can be applied to other types of penalized regresions (e.g. logistic)....continue reading.

In this post, I show some results of predicting height based on DNA mutations. This analysis aims at reproducing the analysis of this paper using my own analysis tools in....continue reading.

In this post, I compare different approaches to get first principal components of large matrices in R. Comparison library(bigstatsr) library(tidyverse) Data # Create two matrices, one with some structure, one...continue reading.

In this post, I try to show you in which situations using a data frame is appropriate, and in which it’s not. Learn more with the Advanced R book. What...continue reading.

In this short post, I talk about why I’m moving away from using function apply. With matrices It’s okay to use apply with a dense matrix, although you can often...continue reading.

In this post, I follow up on a previous post describing how last year in July, I spent one month mostly procrastinating on Stack Overflow (SO). We’re already in July...continue reading.

In this post, I talk about loops in R, why they can be slow and when it is okay to use them. Don’t grow objects Let us generate a matrix...continue reading.

In this post, I talk about performance through an efficient algorithm I developed for finding closest points on a map. This algorithm uses both concepts from mathematics and algorithmics. Problem...continue reading.

In this post, I come back to my first experience teaching an advanced R course over the past month. Content This course was programmed for 10 sessions (3 hours each)...continue reading.

Last weekend, I discovered the pixel art. The goal is to reproduce a pixelated drawing. Anyone can do this without any drawing skills because you just have to reproduce the...continue reading.

In this post, I will analyze the results of the “épreuves classantes nationales (ECN)”, which is a competitive examination at the end of the 6th year of medical school in...continue reading.

In this post, I talk about parallelism in R. This post is likely biased towards the solutions I use. For example, I never use mcapply nor clusterApply; I prefer to...continue reading.